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SELF CLOSING AND LOOKING HATGHWAY DOOR. No. 248,404. I Patented Oct.18,1881.

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J. O. CHAMBERS.

SELF'GLOSING AND LOOKING HATGHWAY DOOR. No. 248,404. Patented Oct.18,1881.

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UNITED STATES PATENT OFFICE.

JOSEPHUS C. CHAMBERS, OF CINCINNATI, OHIO, ASSIGNOR OF THREE- FOURTHS TOCHARLES C. LOCKARD, GEORGE T. STEDMAN, AND GOODRICH H. BARBOUR, ALL OFSAME PLACE.

SELF CLOSING AND LOCKING HATCHWAY-DOOR.

SPECIFICATION forming part of Letters Patent No. 248,404, dated October18, 188].

Application filed August 5, 1881.

To all whom it may concern:

Beitknown that I,JosEPHUs O. CHAMBERS, of Cincinnati, in the county ofHamilton and State of Ohio, have invented new and useful Improvements inSelf Closing and Looking Doors of Elevator-Hatchways, of which thefollowing is a specification;

In order that my invention may be fully understood, I will proceed todescribe it with reference to the accompanying drawings, in Which-Figure 1 is a top view of the hatchway and surrounding parts, the doorsbeing shown closed and locked, and the top of the elevatorframe. Fig. 2is a bottom view thereof, the elevator having passed above. Fig. 3 is atop view, the floor-boards being removed, the doors opened by theelevator, showing the lockingplates in retracted position, and theelevatorplatt'orm in site, and a horizontal section of theelevator-frame on the line of the platform. Fig. 4 is a vertical sectionon a larger scale on the line 4, Fig. 1, looking in the direction of thearrow. Fig. 5 is a vertical section on a larger scale on the line' 5,Fig. 1, looking in the direction of the arrow. Fig. 6 is a verticalsection on the line 6 6, Fig. 3, showing the flanges which work betweenthe rollers to open and close the hatch way-doors, one of which isadapted to push onQthe locking-plate to unlock it.

1 may represent a portion of a parehousefloor surrounding a hatch way.

2 may represent the customary stanchions.

3 3 area pair of sliding doors, of which each door has two pairs ofrollers,4 4, that engage the roller 4 in front and roller 4 in rear offlanges 5, that projectlaterally from cam-braces 6 of elevator 7. Thesaid doors are capable of sliding toward or from one another in suitableguides, 8, either above or below the wareroomfloor or in suitablerecesses, 9, thereof. f the said doors one door, 3, has a pair of studs,10 10. The other door, 3, has a sliding bar or (No model.)

plate, 11, from which project hooks or catches 12 12, which, in thenormal position of the bar, interlock with said studs, as shown inFig. 1. This automatic interlocking is accomplished by means of spring13, which acts to press the plate outward. As the elevator ascends ordescends a corner ot'one ofits advancing flanges, 5, impinges against atappet, 14, upon bar 11, and pushes the bar in direction of arrow, (seeFig. 5,) so as to cause disengagement of hooks 12 12 from studs 10. Atthe same instant the vertical portions 15 of the braces 6 enter and passbetween each pair. of rollers 4 4, which, acted upon by the obliqueportions 16 of said braces, these portions operate to retract the nowunlocked doors to the entirely open position, this position beingmaintained by the vertical portions 17 of said braces 6. Finally, as thecorresponding oblique portion 18 at the remote end of the elevatorreaches the rollers, a precisely reverse action commences and continuesuntil the vertical portions of the braces at that end reaching therollers the doors become completely closed, and on the brace escapingfrom contact with the rollers the spring resumes its functions andrestores the hooks 12 12 to lock. On engagement of the hooks 12 12 uponthe studs l0 10 the doors are locked not only against lateral, but alsoagainst vertical, displacement.

The locking mechanism may be either above the doors, as shown, orbeneath them.

I claim as new and of my invention- The combination, withapairof slidingdoors or shutters, 3 3, of the elevator-brace 6 5 15 16 17 18, tappet14, sliding bar 1], spring 13, hooks 12 12, and studs 10 10, for thepurposes set forth.

In testimony of which invention I hereunto set my hand.

JOSEPHUS C. CHAMBERS.

Attest:

G110. H. KNIGHT, SAML. S. CARPENTER.

